Polycom ViaVideo Technical Reference page 16

Chapter 3
© Polycom, Inc. 2001
Note When you assign port 1720 to the PC running ViaVideo, this
routes all incoming H.323 calls to that PC. This has the
effect that no other devices in your local area network can
receive incoming video or voice over IP calls (this includes
IP phones).
2. Assign the port range to the PC running ViaVideo.
In some firewall interfaces, opening and assigning port numbers
is performed in one step.
In some firewall interfaces, you assign the ports to an IP
address, while in others you assign the ports to an application,
in this case ViaVideo. Either way works fine.
In ViaVideo
Now you need to point ViaVideo at the right port numbers.
1. Go to the Firewall/Lan Connection screen (System
Info>Setup>Lan&Internet>Firewall/LAN Connection).
2. Select the Use Fixed Ports option.
3. If you used the default port range when assigning the ports in
your firewall interface, you don't need to change anything.
ViaVideo automatically enters this range. If you are using a
different range, enter the port numbers for that range here.
4. You should have already performed your NAT configuration. if
not, see "Configure Your ViaVideo for NAT" on page 14, and
follow the instructions listed there.
13
Network Connection
ViaVideo Technical Reference